Vehicle speed estimation method and system for vehicle stability control system
A stability control and vehicle speed technology, applied in the direction of control devices, etc., can solve problems such as poor applicability, failure to consider the impact of vehicles, and defects in vehicle speed estimation algorithms, and achieve the effects of improving accuracy and applicability, high reliability, and small calculation load
Active Publication Date: 2020-10-27
清华大学苏州汽车研究院(吴江)
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Problems solved by technology
However, in these patents, the impact of vehicle driving state changes on vehicle speed estimation is not considered, and there are still defects in the vehicle speed estimation algorithm.
At present, most of the vehicle speed estimation methods used in China have the problems of lack of both real-time performance and accuracy, and poor applicability.
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[0035] The preferred embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0036] In order to improve the accuracy of the vehicle speed estimation method, the applicability of the algorithm in many working conditions is enhanced, such as figure 1 As shown, the vehicle speed estimation system of the vehicle stability control system of the present invention includes a sensor signal processing unit, a vehicle driving state identification unit, a sensor signal correction unit and a vehicle speed estimation unit. Use the existing wheel speed, steering wheel angle, longitudinal acceleration, yaw rate, brake switch signal and other information on the vehicle to identify the driving state of the vehicle, and correct the wheel speed and longitudinal acceleration according to different driving states. The volumetric Kalman filter of the layer structure estimates the vehicle speed, such as figure 2 As shown, the specific s...
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The invention discloses an automobile speed estimation method and system for an automobile stability control system. The method comprises the steps that the driving states of an automobile are identified, and reference wheel speeds under all the driving states are calculated; a volume Kalman filter based on a kinematic model and a volume Kalman filter based on a dynamical model are established separately, through a confidence coefficient, the two volume Kalman filters are fused to form a volume Kalman filter of a double-layer architecture, and automobile speed estimation is conducted. The volume Kalman filter of the double-layer architecture is established, and the precision and applicability of automobile speed estimation are improved. Without dependence on a large quantity of real automobile tests, the method has the advantages of being small in calculation amount and high in reliability.
Description
technical field [0001] The invention relates to a vehicle speed estimation method, in particular to a vehicle speed estimation method and system of a vehicle stability control system of a two-wheel drive motor vehicle. Background technique [0002] Vehicle stability control system (Dynamic Stability Control, DSC) of two-wheel drive motor vehicles, which integrates anti-lock brake system (Anti-lock Braking System, ABS), traction control system (Traction Control System, TCS) and The three subsystems of active yaw control (Active Yaw Control, AYC) can correspond to their respective vehicle dynamics motion modes according to various working conditions such as emergency braking, partial braking, coasting, driving, and steering. The distribution and size of force and lateral force can improve the active safety performance of the vehicle. [0003] Active vehicle safety systems such as anti-lock braking system ABS, traction control system TCS, and vehicle dynamics stability control...
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IPC IPC(8): B60W50/00
CPCB60W50/0098B60W2050/0052
Inventor 戴一凡戴希曾勇徐巍张晓丽
Owner 清华大学苏州汽车研究院(吴江)